Chemicals HPMC with Cement and Gypsum Plaster Skim Coat

HPMC, or Hydroxypropyl Methyl Cellulose, is a common additive used in skim coats made with cement and gypsum plaster. It acts as a multi-functional ingredient, improving the overall quality and workability of the final product. Here’s how HPMC benefits skim coats:

  • Water Retention: One of the key benefits of HPMC is its ability to retain water within the mix. This prevents the skim coat from drying out too quickly, which can lead to cracking and shrinkage. By allowing for slower drying, HPMC gives applicators more working time and a smoother finish.
  • Improved Workability: HPMC enhances the workability of the skim coat mixture. It makes the material more plastic and easier to spread, reducing the effort required for application and improving overall finish.
  • Adhesion: HPMC promotes better adhesion between the skim coat and the underlying surface. It forms a thin film that acts as a bonding agent, ensuring a strong and secure connection.
  • Strength: While not the main function, HPMC can also contribute to a slight increase in the tensile and shear strength of the finished skim coat.


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